One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6)(7,16)(8,20)(9,14)(10,13)(11,18)(12,23)(15,24)(17,30)(19,29)(21,27)(22,32)(25,28)(26,31)(33,35)(34,36) involution — undirected(1,2,4,3)(5,7,9,18)(6,11,14,16)(8,21,22,35)(10,25,24,19)(12,30,31,36)(13,29,15,28)(17,23,34,26)(20,33,32,27)(5,8)(6,12)(7,17)(9,22)(10,26)(11,27)(13,20)(14,31)(15,32)(16,33)(18,34)(19,21)(23,24)(25,35)(28,36)(29,30) involution — undirected(6,13)(10,24)(11,28)(12,20)(14,15)(16,29)(19,25)(21,35)(23,26)(27,36)(30,33)(31,32) involution — undirected(1,3,4,2)(6,14)(11,16)(12,31)(13,15)(20,32)(27,33)(28,29)(30,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.